water levels have risen onto land in some parts of guerneville. and even though it's normally a slow-moving river... >> with 6-7 ft. it begins to get scary. we have to think about leaving town, turning off electricity, gasoline. and so forth. >> the national weather service says that it could be possibly a flooded road to a.m. with noon tomorrow reaching the highest levels. in this video shot yesterday, you can see that the river is rising fast. flooding, every decade or so, is not uncommon. the last serious threat was in the first days of january 06 of course the possibility always makes residents nervous. the national weather service says the russian river will flood guerneville around 2 a.m. monday... highest point around noon tomorrow... with water levels >> the latest series of storms has some arborists concerned about trees in the bay area. the saturated ground could force trees and bushes to collapse. about the threat. >> all of the whe--wieight.. is at the top of the tree. >> certified arborist christopher altman pointing these dangers out